Do you have a multimeter? Set it to continuity or resistance and see if you have a link between the sender and the T. That will solve uncertainty if the teflon tape is blocking the ground. Alos you could test continuuity from the T to another part of the T, to see if there is any coating on the brass that is non-conductive.

What are you using at the ground point? An easy way to do it is to just put in a selftapping screw in the frame. A better way to do it is to use a serrated washer that will cut through the paint and or oxidation.

CHRIS
98 Amigo, 92 Pup

need a pickup 1st gen fuel level sender